Wishbone: I think he's probably talking about non-game-specific codes, such as what you get (or used to at least, I don't know how the store credit thing works) when you buy a regionally priced game that is more expensive than the US price. As far as I know, what you do with those codes (typically worth $5.99 or $9.99) is to add the game you want to your cart, then go to the checkout screen, on which there is a field for inputting those kinds of codes.
Exactly, thank you. The problem is i want a specific game, Imperialism II, but when I introduce the code it goes to page 1/27 of a list of games that the code works on (due to the price). Its not in the 1st ten pages and i cant seem to be able to get to the 11th, and many times it crashes before also.
Its not the 1st type of these codes that a i redeem (with Divinity Original Sin comes one of $5.99 and one of $9.99), but the first time it had a search so you did not have to manualy look for the game.